package com.hmall.trade.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmall.api.item.ItemClient;
import com.hmall.api.item.dto.ItemDTO;
import com.hmall.api.item.dto.OrderDetailDTO;
import com.hmall.common.constants.MqConstants;
import com.hmall.common.domain.CartClearMessage;
import com.hmall.common.exception.BadRequestException;
import com.hmall.common.utils.BeanUtils;
import com.hmall.common.utils.UserContext;
import com.hmall.trade.domain.dto.OrderFormDTO;
import com.hmall.trade.domain.po.Order;
import com.hmall.trade.domain.po.OrderDetail;
import com.hmall.trade.mapper.OrderMapper;
import com.hmall.trade.service.IOrderDetailService;
import com.hmall.trade.service.IOrderService;
import io.seata.spring.annotation.GlobalTransactional;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.*;
import java.util.stream.Collectors;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2023-05-05
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Order> implements IOrderService {

    private final ItemClient itemClient;

    private final IOrderDetailService detailService;
    private final RabbitTemplate rabbitTemplate;
    // 注入orderDetailService
    private final IOrderDetailService orderDetailService;

    @Override
    @GlobalTransactional
    public Long createOrder(OrderFormDTO orderFormDTO) {
        // 1.订单数据
        Order order = new Order();
        // 1.1.查询商品
        List<OrderDetailDTO> detailDTOS = orderFormDTO.getDetails();
        // 1.2.获取商品id和数量的Map
        Map<Long, Integer> itemNumMap = detailDTOS.stream()
                                                  .collect(Collectors.toMap(
                                                          OrderDetailDTO::getItemId,
                                                          OrderDetailDTO::getNum
                                                                           ));
        Set<Long> itemIds = itemNumMap.keySet();
        // 1.3.查询商品
        List<ItemDTO> items = itemClient.queryItemByIds(itemIds);
        if (items == null || items.size() < itemIds.size()) {
            throw new BadRequestException("商品不存在");
        }
        // 1.4.基于商品价格、购买数量计算商品总价：totalFee
        int total = 0;
        for (ItemDTO item : items) {
            total += item.getPrice() * itemNumMap.get(item.getId());
        }
        order.setTotalFee(total);

        Long userId = UserContext.getUser();
        // 1.5.其它属性
        order.setPaymentType(orderFormDTO.getPaymentType());
        order.setUserId(userId);
        order.setStatus(1);
        // 1.6.将Order写入数据库order表中
        save(order);

        // 2.保存订单详情
        List<OrderDetail> details = buildDetails(order.getId(), items, itemNumMap);
        detailService.saveBatch(details);

        // 3.清理购物车商品，通过mq异步处理
        // 准备消息
        CartClearMessage message = new CartClearMessage();
        message.setUserId(userId);
        message.setItemIds(itemIds);
        // 发送消息
        rabbitTemplate.convertAndSend(MqConstants.TRADE_EXCHANGE_NAME, MqConstants.ORDER_CREATE_KEY, message);

        // 4.扣减库存
        try {
            itemClient.deductStock(detailDTOS);
        }
        catch (Exception e) {
            throw new RuntimeException("库存不足！");
        }

        // TODO 发送延迟消息，修改订单状态已支付
        rabbitTemplate.convertAndSend(
                MqConstants.DELAY_EXCHANGE_NAME, MqConstants.DELAY_ORDER_KEY, order.getId(),
                message1 -> {
                    // 设置延迟时间,35分钟后执行
                    //                    message1.getMessageProperties().setDelay(35 * 60 * 1000);
                    message1.getMessageProperties().setDelay(10 * 1000);
                    log.info("延迟消息发送成功:{}", Arrays.toString(message1.getBody()));
                    return message1;
                }
                                     );

        return order.getId();
    }

    @Override
    public void markOrderPaySuccess(Long orderId) {
        Order order = new Order();
        order.setId(orderId);
        order.setStatus(2);
        order.setPayTime(LocalDateTime.now());
        updateById(order);
    }

    private List<OrderDetail> buildDetails(Long orderId, List<ItemDTO> items, Map<Long, Integer> numMap) {
        List<OrderDetail> details = new ArrayList<>(items.size());
        for (ItemDTO item : items) {
            OrderDetail detail = new OrderDetail();
            detail.setName(item.getName());
            detail.setSpec(item.getSpec());
            detail.setPrice(item.getPrice());
            detail.setNum(numMap.get(item.getId()));
            detail.setItemId(item.getId());
            detail.setImage(item.getImage());
            detail.setOrderId(orderId);
            details.add(detail);
        }
        return details;
    }

    // todo 取消订单,注意幂等性
    @Override
    public void cancelOrder(Long orderId) {

        // 幂等性校验
        Order order = getById(orderId);
        if (order.getStatus() != 1) {
            throw new BadRequestException("订单已取消");
        }

        // 1.修改订单状态为已关闭
        order.setStatus(5);
        order.setCloseTime(LocalDateTime.now());
        order.setUpdateTime(LocalDateTime.now());
        updateById(order);

        // 2.恢复库存
        // 2.1.查询订单详情
        List<OrderDetail> orderDetails = orderDetailService.lambdaQuery().eq(OrderDetail::getOrderId, orderId).list();
        List<OrderDetailDTO> orderDetailDTOs = BeanUtils.copyList(orderDetails, OrderDetailDTO.class);
        // 2.2.恢复库存
        itemClient.restoreStock(orderDetailDTOs);
    }
}
